CN111769541B - Power supply circuit, terminal accessory and method for preventing voltage backflow - Google Patents
Power supply circuit, terminal accessory and method for preventing voltage backflow Download PDFInfo
- Publication number
- CN111769541B CN111769541B CN202010743303.8A CN202010743303A CN111769541B CN 111769541 B CN111769541 B CN 111769541B CN 202010743303 A CN202010743303 A CN 202010743303A CN 111769541 B CN111769541 B CN 111769541B
- Authority
- CN
- China
- Prior art keywords
- power supply
- transistor
- circuit
- power
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/108—Parallel operation of dc sources using diodes blocking reverse current flow
Abstract
A power supply circuit comprises a first power supply input end and a second power supply input end which are respectively connected between a first power supply input end used for inputting a first power supply and a second power supply input end used for inputting a second power supply and a power supply circuit output end used for supplying power to a load, so that the first power supply and the second power supply input by the first power supply input end and the second power supply input end are output to the power supply circuit output end. The power-off isolation circuit is used for isolating the input end of the first power supply when the first power supply loses power so as to prevent the voltage at the output end of the power supply circuit from flowing back to the input end of the first power supply, and is also used for isolating the input end of the second power supply when the second power supply loses power so as to prevent the voltage at the output end of the power supply circuit from flowing back to the input end of the second power supply. Because the input end of losing power is isolated by the power-off isolation circuit, the voltage of the output end can not flow back to the input end of losing power.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a power supply circuit, a terminal accessory for preventing voltage backflow and a method.
Background
At present, a power supply circuit of a communication interface is often required to maintain data communication in the use process, such as a plug and play device interface including a USB interface. Wherein, the USB interface gives consideration to the power supply and the communication function. Because the power consumption of part of the load is larger, the single use of the USB interface for power supply can not ensure the full-function operation of the load, therefore, an external power supply port is usually added to the load so as to adopt double power supplies to supply power to the load. The problems of efficiency and switching of power supply by adopting double power supplies are still to be solved in the field of double power supply.
Disclosure of Invention
The application provides a power supply circuit for solve the not enough of dual supply power among the prior art.
According to a first aspect, there is provided in an embodiment a power supply circuit comprising:
a first output channel circuit connected between a first power supply input terminal for inputting a first power supply and a power supply circuit output terminal for supplying power to a load, to output the first power supply inputted from the first power supply input terminal to the power supply circuit output terminal;
the second output channel circuit is connected between a second power supply input end used for inputting a second power supply and a power supply circuit output end used for supplying power to a load so as to output the second power supply input by the second power supply input end to the power supply circuit output end;
the power-off isolation circuit is respectively connected with the first power supply input end, the second power supply input end, the power supply circuit output end and the second output channel circuit;
when the first power supply loses power, the input end of the first power supply is isolated to prevent the voltage at the output end of the power supply circuit from flowing back to the input end of the first power supply;
when the second power supply loses power, the input end of the second power supply is isolated, so that the voltage at the output end of the power supply circuit is prevented from flowing back to the input end of the second power supply.
Further, the first output channel circuit comprises a diode D1, a positive connection terminal of the diode D1 is connected with the first power supply input terminal, and a negative connection terminal of the diode D1 is connected with the power supply circuit output terminal.
Further, the first output channel circuit further comprises at least one capacitor C1 connected between the positive connection terminal of the diode D1 and ground;
and/or the first output channel circuit further comprises at least one capacitor C2 connected between the negative connection terminal of the diode D1 and ground.
Further, the second output channel circuit includes a transistor Q0, a resistor R1, and a resistor R2; a first pole of the transistor Q0 is connected to the second power supply input terminal, a second pole of the transistor Q0 is connected to the power supply circuit output terminal, a control pole of the transistor Q0 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the power-off isolation circuit; one end of the resistor R2 is connected to the control electrode of the transistor Q0, and the other end is grounded.
Further, the second output channel circuit further comprises at least one capacitor C3 connected between the first pole of the transistor Q0 and ground.
Further, the power-loss isolation circuit comprises a transistor Q1, a transistor Q2, a resistor R3 and a resistor R4; the first pole of the transistor Q1 is connected to the second output channel circuit, the second pole of the transistor Q1 is connected to the output terminal of the power supply circuit, the control pole of the transistor Q1 is connected to one end of the resistor R3, and the other end of the resistor R3 is grounded; a first pole of the transistor Q2 is connected to a first pole of the transistor Q1, a second pole of the transistor Q2 is connected to the first power supply input, and a control pole of the transistor Q2 is connected to a control pole of the transistor Q1; one end of the resistor R4 is connected with the control electrode of the transistor Q2, and the other end of the resistor R4 is connected with the second power supply input end.
Further, the transistors Q0, Q1 and/or the transistor Q2 are P-type MOS transistors.
Further, the voltage value of the first power supply and/or the second power supply is 5V.
According to a second aspect, an embodiment provides a terminal accessory for preventing voltage backflow, which is used for connecting with a terminal device, the terminal accessory includes the power supply circuit of the first aspect, wherein the terminal accessory is one or more of a docking station, a network card, a hard disk cartridge or a switcher.
According to a third aspect, an embodiment provides a method for preventing voltage backflow, the method being applied to the power supply circuit of the first aspect, and the method comprising:
judging whether the first power supply loses power, if so, isolating the input end of the first power supply to prevent the voltage at the output end of the power supply circuit from flowing back to the input end of the first power supply;
or judging whether the second power supply loses power, if so, isolating the input end of the second power supply to prevent the voltage at the output end of the power supply circuit from flowing back to the input end of the second power supply.
The power supply circuit according to the above embodiment includes a first output channel circuit, a second output channel circuit, and a power loss isolation circuit. The first output channel circuit and the second output channel circuit are respectively connected between a first power supply input end used for inputting the first power supply, a second power supply input end used for inputting the second power supply and a power supply circuit output end used for supplying power to a load, so that the first power supply and the second power supply input by the first power supply input end and the second power supply input end are output to the power supply circuit output end. The power-off isolation circuit is used for isolating the input end of the first power supply when the first power supply loses power so as to prevent the voltage at the output end of the power supply circuit from flowing back to the input end of the first power supply, and is also used for isolating the input end of the second power supply when the second power supply loses power so as to prevent the voltage at the output end of the power supply circuit from flowing back to the input end of the second power supply. Because the input end of losing power is isolated by the power-off isolation circuit, the voltage of the output end can not flow back to the input end of losing power.
Drawings
FIG. 1 is a circuit schematic of a power supply circuit;
FIG. 2 is a schematic diagram of the tube voltage drop of a diode in a power supply circuit as a function of current;
FIG. 3 is a schematic diagram of an embodiment of a power supply circuit;
fig. 4 is a circuit diagram of a power supply circuit in an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
Referring to fig. 1, a circuit diagram of a power supply circuit IN the prior art is shown, IN which the power supply circuit includes a first power supply input terminal IN1, a second power supply input terminal IN2, a power supply circuit output terminal OUT, and two diodes D0. IN one embodiment, the first power supply input terminal IN1 is used for inputting an external power supply, the second power supply input terminal IN2 is used for inputting a USB power supply, and the power supply circuit output terminal OUT is used for connecting with a power supply input terminal of a load. One diode D0 has one end connected to the first power supply input terminal IN1 and the other end connected to the power supply circuit output terminal OUT, and the other diode D0 has one end connected to the second power supply input terminal IN2 and the other end connected to the power supply circuit output terminal OUT. The two diodes D0 form an or gate circuit, so that the power input from the first power supply input terminal IN1 and/or the second power supply input terminal IN2 supplies power to the power supply circuit output terminal OUT. That is, when the external power is input at the first power input terminal IN1 and no power is supplied at the second power input terminal IN2, the or gate circuit allows the external power to supply power to the load. The OR gate enables the USB power supply to supply power to the load when the first power supply input IN1 provides no power input and the second power supply input IN2 provides a power input. When the first power supply input terminal IN1 and the second power supply input terminal IN2 have power inputs at the same time, the or gate circuit allows the external power supply and the USB power supply to simultaneously supply power to the load. From this, prior art can not realize that external power supply and USB power supply switch the power supply, and simultaneously, the pipe drop of diode when switching on is great to can increase along with the increase of electric current, this makes the voltage of supply circuit output OUT be less than supply voltage and can fluctuate along with the change of electric current, thereby has caused supply circuit's supply voltage unstability, and has great loss, has reduced supply circuit's power supply efficiency.
Referring to fig. 2, a schematic diagram of the tube voltage drop of the diode in the power supply circuit varying with the current is shown, wherein the tube voltage drop Vd of the diode D0 is about 0.6V when the current Id flowing through the diode D0 reaches 100mA, and the tube voltage drop Vd of the diode D0 exceeds 1V when the current Id flowing through the diode D0 reaches 1000 mA. Therefore, when the power supply circuit is fully operated, the larger current will cause the tube voltage drop of the diode D0 to be larger, so that the input voltage of the external power supply and/or the USB power supply cannot be fully supplied to the load, i.e. the voltage at the output terminal OUT of the power supply circuit is smaller than the input voltage of the external power supply and/or the USB power supply. Also, since the tube voltage drop of the diode D0 varies with the current, when the power of the load varies, the voltage at the output terminal OUT of the power supply circuit fluctuates, and the low and unstable power supply voltage makes the power supply of the load unstable, which increases the probability that the operation of the load is unstable. Meanwhile, because the current flowing through the diode D0 is large, the power loss of the diode D0 is also large, so that the power supply efficiency of the load is low, and the diode D0 generates heat seriously, which may reduce the service life of the diode D0.
In the embodiment of the application, a power supply circuit is disclosed, which comprises a first power supply input end and a second power supply input end, which are respectively connected between the first power supply input end for inputting the first power supply and the second power supply input end for inputting the second power supply and the power supply circuit output end for providing power supply for a load, so as to output the first power supply and the second power supply input by the first power supply input end and the second power supply input end to the power supply circuit output end. The power-off isolation circuit is used for isolating the input end of the first power supply when the first power supply loses power so as to prevent the voltage at the output end of the power supply circuit from flowing back to the input end of the first power supply, and is also used for isolating the input end of the second power supply when the second power supply loses power so as to prevent the voltage at the output end of the power supply circuit from flowing back to the input end of the second power supply. Because the input end of losing power is isolated by the power-off isolation circuit, the voltage of the output end can not flow back to the input end of losing power.
Some terms referred to in the present application will be described first.
The Transistor in the present application may be a Transistor with any structure, such as a Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET), which is a Field-Effect Transistor (Field-Effect Transistor) that can be widely used in analog circuits and digital circuits. MOSFETs are classified into "N-type" and "P-type" types according to their "channel" (working carrier) polarities, and are also commonly referred to as NMOSFETs and PMOSFETs, and other types include NMOS and PMOS for short. Such as Bipolar Junction Transistors (BJTs) or Field Effect Transistors (FETs). When the transistor is a bipolar transistor, the control electrode of the transistor refers to the grid electrode of the bipolar transistor, the first electrode can be the collector or the emitter of the bipolar transistor, the corresponding second electrode can be the emitter or the collector of the bipolar transistor, and in the practical application process, the emitter and the collector can be interchanged according to the signal flow direction; when the transistor is a field effect transistor, the control electrode refers to a gate electrode of the field effect transistor, the first electrode may be a drain electrode or a source electrode of the field effect transistor, and the corresponding second electrode may be a source electrode or a drain electrode of the field effect transistor, and in an actual application process, "source electrode" and "drain electrode" may be interchanged according to a signal flow direction.
Example one
Referring to fig. 3, a schematic structural diagram of a power supply circuit in an embodiment includes a first output channel circuit 1, a second output channel circuit 3, and a power-off isolation circuit 2. The first output channel circuit 1 is connected between a first power supply input terminal IN1 for input of a first power supply and a power supply circuit output terminal OUT for supplying power to a load to output the first power supply input from the first power supply input terminal IN1 to the power supply circuit output terminal OUT. The second output channel circuit 3 is connected between the second power supply input terminal IN2 for input of the second power supply and the power supply circuit output terminal OUT for supplying power to the load to output the second power supply input from the second power supply input terminal IN2 to the power supply circuit output terminal OUT. The power-loss isolation circuit 2 is respectively connected with the first power supply input end IN1, the second power supply input end IN2, the power supply circuit output end OUT and the second output channel circuit 3. When the first power supply loses power, the power-loss isolation circuit 2 isolates the first power supply input terminal IN1 to prevent the voltage at the output terminal of the power supply circuit from flowing back to the first power supply input terminal IN 1. When the second power supply loses power, the power-loss isolation circuit 2 isolates the second power supply input terminal IN2 to prevent the voltage at the power supply circuit output terminal OUT from flowing back to the second power supply input terminal IN 2. The first power supply input terminal IN1 is used for inputting the first power supply, the second power supply input terminal IN2 is used for inputting the second power supply, and the power supply circuit output terminal OUT is used for connecting a load to supply power to the load.
Referring to fig. 4, a circuit diagram of a power supply circuit in an embodiment includes a first output channel circuit 1, a second output channel circuit 3, and a power-off isolation circuit 2. The first output channel circuit 1 includes a diode D1, a positive connection terminal of the diode D1 is connected to the first power supply input terminal IN1, and a negative connection terminal of the diode D1 is connected to the power supply circuit output terminal OUT. The first output channel circuit 1 further comprises at least one capacitor C1 connected between the positive connection of the diode D1 and ground, and the first output channel circuit 1 further comprises at least one capacitor C2 connected between the negative connection of the diode D1 and ground. In one embodiment, the first output channel circuit 1 includes two capacitors C1. The second output channel circuit 3 comprises a transistor Q0, a resistor R1 and a resistor R2, a first pole of the transistor Q0 is connected with a second power supply input end IN2, a second pole of the transistor Q0 is connected with a power supply circuit output end OUT, a control pole of the transistor Q0 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with the power-off isolation circuit 2, one end of the resistor R2 is connected with the control pole of the transistor Q0, and the other end of the resistor R2 is grounded. In one embodiment, the second output channel circuit further comprises at least one capacitor C3 connected between the first pole of the transistor Q0 and ground. In one embodiment, the transistor Q0 is a P-type MOS transistor. The power-loss isolation circuit 2 comprises a transistor Q1, a transistor Q2, a resistor R3 and a resistor R4, wherein a first pole of the transistor Q1 is connected with a second output channel circuit, a second pole of the transistor Q1 is connected with an output end OUT of a power supply circuit, a control pole of the transistor Q1 is connected with one end of the resistor R3, the other end of the resistor R3 is grounded, a first pole of the transistor Q2 is connected with a first pole of the transistor Q1, a second pole of the transistor Q2 is connected with a first power supply input end, a control pole of the transistor Q2 is connected with a control pole of the transistor Q1, one end of the resistor R4 is connected with a control pole of the transistor Q2, and the other end of the resistor R4 is connected with a second power supply input end IN 2. In one embodiment, the transistors Q1 and Q2 are P-type MOS transistors. In one embodiment, the voltage values of the first power supply and the second power supply are 5V.
In the power supply circuit in the embodiment of the application, when the first power supply at the input end of the first power supply supplies power and the second power supply at the input end of the first power supply does not supply power, the diode D1, the transistor Q1 and the transistor Q2 are turned on, the output end of the power supply circuit outputs the first power supply, and no reverse voltage is output at the input end of the second power supply because the transistor Q0 is turned off, so that the backflow of the voltage at the output end is prevented. When the second power supply at the input end of the second power supply supplies power and the input end of the first power supply does not supply power, the transistor Q0 is switched on, the output end of the power supply circuit outputs the second power supply, the diode D1, the transistor Q1 and the transistor Q2 are switched off, and no reverse voltage is output at the input end of the first power supply, so that the backflow of the voltage at the output end is prevented.
In one embodiment, the voltage supplied by the first power supply and the second power supply is 5V, the first power supply and the second power supply power simultaneously, when one of the power supplies loses power, the other power supply is automatically switched to supply power, and the output voltage of the output end of the power supply circuit is 4.95V. When one of the input end of the first power supply and the input end of the second power supply inputs the power supply first and the other inputs the power supply later, the load capacity of the output end of the power supply circuit reaches 5V 1.5A, and the two input ends are isolated from each other, so that bidirectional voltage isolation is realized.
In an embodiment of the present application, a terminal accessory for preventing voltage backflow is further disclosed, which is used for connecting with a terminal device, and the terminal accessory includes the power supply circuit as described above. The terminal accessory provided by the invention can effectively protect the terminal equipment and is not damaged by voltage backflow.
How to prevent the voltage backflow for the terminal accessory is described in detail in the power supply circuit, and therefore, the detailed description thereof is omitted.
In an embodiment of the present application, a method for preventing voltage backflow is further disclosed, which is applied to the power supply circuit described above, and the method includes:
and judging whether the first power supply loses power, if so, isolating the input end of the first power supply to prevent the voltage at the output end of the power supply circuit from flowing back to the input end of the first power supply. Or, judging whether the second power supply loses power, if so, isolating the input end of the second power supply to prevent the voltage at the output end of the power supply circuit from flowing back to the input end of the second power supply.
The method for preventing the voltage backflow can effectively protect the terminal equipment and is not damaged by the voltage backflow.
The method for preventing the voltage is described in detail in the power supply circuit, and therefore, the detailed description thereof is omitted.
The power supply circuit, the terminal accessory for preventing the voltage backflow and the method are disclosed in the embodiment of the application, wherein the power supply circuit comprises a first power supply input end and a second power supply input end which are respectively connected between the first power supply input end used for inputting the first power supply, the second power supply input end used for inputting the second power supply and the power supply circuit output end used for providing power for a load, so that the first power supply and the second power supply input by the first power supply input end and the second power supply input end are output to the power supply circuit output end. The power-off isolation circuit is used for isolating the input end of the first power supply when the first power supply loses power so as to prevent the voltage at the output end of the power supply circuit from flowing back to the input end of the first power supply, and is also used for isolating the input end of the second power supply when the second power supply loses power so as to prevent the voltage at the output end of the power supply circuit from flowing back to the input end of the second power supply. Because the power-off isolation circuit can realize the intelligent switching of power supply of the double input ends and isolate the power-off input ends, the voltage of the output end can not flow back to the power-off input ends, the bidirectional voltage isolation is realized, the equipment can be effectively protected, and the use safety performance of the equipment and the circuit is improved.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (8)
1. A power supply circuit, comprising:
a first output channel circuit connected between a first power supply input terminal for inputting a first power supply and a power supply circuit output terminal for supplying power to a load, to output the first power supply inputted from the first power supply input terminal to the power supply circuit output terminal;
the second output channel circuit is connected between a second power supply input end used for inputting a second power supply and a power supply circuit output end used for supplying power to a load so as to output the second power supply input by the second power supply input end to the power supply circuit output end;
the power-off isolation circuit is respectively connected with the first power supply input end, the second power supply input end, the power supply circuit output end and the second output channel circuit;
when the first power supply loses power, the input end of the first power supply is isolated to prevent the voltage at the output end of the power supply circuit from flowing back to the input end of the first power supply;
when the second power supply loses power, isolating the input end of the second power supply to prevent the voltage at the output end of the power supply circuit from flowing back to the input end of the second power supply;
the second output channel circuit comprises a transistor Q0, a resistor R1 and a resistor R2; a first pole of the transistor Q0 is connected to the second power supply input terminal, a second pole of the transistor Q0 is connected to the power supply circuit output terminal, a control pole of the transistor Q0 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the power-off isolation circuit; one end of the resistor R2 is connected with the control electrode of the transistor Q0, and the other end is grounded;
the power-loss isolation circuit comprises a transistor Q1, a transistor Q2, a resistor R3 and a resistor R4; a first pole of the transistor Q1 is connected to one end of the resistor R1, a second pole of the transistor Q1 is connected to the output end of the power supply circuit, a control pole of the transistor Q1 is connected to one end of the resistor R3, and the other end of the resistor R3 is grounded; a first pole of the transistor Q2 is connected to a first pole of the transistor Q1, a second pole of the transistor Q2 is connected to the first power supply input, and a control pole of the transistor Q2 is connected to a control pole of the transistor Q1; one end of the resistor R4 is connected with the control electrode of the transistor Q2, and the other end of the resistor R4 is connected with the second power supply input end.
2. The power supply circuit of claim 1 wherein said first output channel circuit includes a diode D1, a positive connection of said diode D1 being connected to said first power supply input, and a negative connection of a diode D1 being connected to said power supply circuit output.
3. The power supply circuit of claim 2 wherein said first output channel circuit further comprises at least one capacitor C1 connected between the positive connection of diode D1 and ground;
and/or the first output channel circuit further comprises at least one capacitor C2 connected between the negative connection terminal of the diode D1 and ground.
4. The power supply circuit of claim 1 wherein said second output channel circuit further comprises at least one capacitor C3 connected between said first pole of transistor Q0 and ground.
5. The power supply circuit as claimed in claim 1, wherein the transistor Q0 is a P-type MOS transistor;
the transistor Q1 and the transistor Q2 are P-type MOS transistors.
6. The power supply circuit according to claim 1, wherein the voltage value of the first power supply and/or the second power supply is 5V.
7. A terminal accessory for preventing voltage backflow, which is used for connecting with a terminal device, the terminal accessory comprising the power supply circuit of any one of claims 1 to 6, wherein the terminal accessory is one or more of a docking station, a network card, a hard disk cartridge or a switcher.
8. A method for preventing voltage backflow, wherein the method is applied to the power supply circuit of any one of claims 1 to 6, and the method comprises:
judging whether the first power supply loses power, if so, isolating the input end of the first power supply to prevent the voltage at the output end of the power supply circuit from flowing back to the input end of the first power supply;
or judging whether the second power supply loses power, if so, isolating the input end of the second power supply to prevent the voltage at the output end of the power supply circuit from flowing back to the input end of the second power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010743303.8A CN111769541B (en) | 2020-07-29 | 2020-07-29 | Power supply circuit, terminal accessory and method for preventing voltage backflow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010743303.8A CN111769541B (en) | 2020-07-29 | 2020-07-29 | Power supply circuit, terminal accessory and method for preventing voltage backflow |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111769541A CN111769541A (en) | 2020-10-13 |
| CN111769541B true CN111769541B (en) | 2022-03-15 |
Family
ID=72727821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010743303.8A Active CN111769541B (en) | 2020-07-29 | 2020-07-29 | Power supply circuit, terminal accessory and method for preventing voltage backflow |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111769541B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113690844B (en) * | 2021-08-07 | 2022-06-07 | 东莞市海能电子有限公司 | Circuit, method and equipment for preventing current backflow for video interface |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102104274A (en) * | 2009-12-02 | 2011-06-22 | 技嘉科技股份有限公司 | Electronic device with battery parallel circuit |
| CN109617040A (en) * | 2018-12-24 | 2019-04-12 | 出门问问信息科技有限公司 | A kind of power supply circuit |
| CN208849457U (en) * | 2018-10-22 | 2019-05-10 | Tcl通力电子（惠州）有限公司 | Power supply switch circuit and multiple-way feed system |
| CN208862634U (en) * | 2018-11-06 | 2019-05-14 | 厦门锐益达电子科技有限公司 | A kind of power supply switching power supply circuit |
| CN110808629A (en) * | 2019-10-15 | 2020-02-18 | 合肥联宝信息技术有限公司 | Dual-power switching circuit and dual-power switching controller |
| CN111316519A (en) * | 2019-03-26 | 2020-06-19 | 深圳欣锐科技股份有限公司 | Backflow prevention circuit, power supply and backflow prevention method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8009404B2 (en) * | 2007-12-21 | 2011-08-30 | Lockheed Martin Corporation | Redundant power supply with a switchable, linear voltage regulator |
-
2020
- 2020-07-29 CN CN202010743303.8A patent/CN111769541B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102104274A (en) * | 2009-12-02 | 2011-06-22 | 技嘉科技股份有限公司 | Electronic device with battery parallel circuit |
| CN208849457U (en) * | 2018-10-22 | 2019-05-10 | Tcl通力电子（惠州）有限公司 | Power supply switch circuit and multiple-way feed system |
| CN208862634U (en) * | 2018-11-06 | 2019-05-14 | 厦门锐益达电子科技有限公司 | A kind of power supply switching power supply circuit |
| CN109617040A (en) * | 2018-12-24 | 2019-04-12 | 出门问问信息科技有限公司 | A kind of power supply circuit |
| CN111316519A (en) * | 2019-03-26 | 2020-06-19 | 深圳欣锐科技股份有限公司 | Backflow prevention circuit, power supply and backflow prevention method |
| CN110808629A (en) * | 2019-10-15 | 2020-02-18 | 合肥联宝信息技术有限公司 | Dual-power switching circuit and dual-power switching controller |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111769541A (en) | 2020-10-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102379554B1 (en) | Protection circuit | |
| US7038522B2 (en) | System and method for redundant power supply connection | |
| CN101946383B (en) | Method and circuit for bi-directional over-voltage protection | |
| US7911192B2 (en) | High voltage power regulation using two power switches with low voltage transistors | |
| US8106711B2 (en) | Stacked pre-driver amplifier | |
| CN1937344B (en) | Method of forming an integrated voltage protection device and structure | |
| US20150028922A1 (en) | Transistor switch with temperature compensated vgs clamp | |
| CN102231598A (en) | Power supply circuit | |
| US10256813B2 (en) | Fast transient high-side gate driving circuit | |
| CN111769541B (en) | Power supply circuit, terminal accessory and method for preventing voltage backflow | |
| CN110890749A (en) | Power supply reverse connection prevention circuit and power supply circuit | |
| US6859089B2 (en) | Power switching circuit with controlled reverse leakage | |
| US6633470B2 (en) | Overvoltage protection circuit for bidirectional transmission gate | |
| US9921599B2 (en) | Voltage switching circuit and power supply device with regulator | |
| CN113885644B (en) | Substrate switching circuit for preventing LDO backflow | |
| US20220244770A1 (en) | Usb power delivery interface | |
| CN115776103A (en) | Low-power-consumption input reverse connection prevention function control circuit | |
| CN103098375A (en) | Controlled switch | |
| CN209895208U (en) | Controllable linear voltage stabilizer | |
| CN210629454U (en) | Digital level conversion circuit based on low-voltage CMOS (complementary metal oxide semiconductor) process | |
| CN103972931A (en) | Input line selector for battery charger | |
| CN220673618U (en) | Current backflow prevention circuit, main board and electronic equipment | |
| CN111434001B (en) | Capacitor balanced driver circuit for dual input charger | |
| CN109194126B (en) | Power supply switching circuit | |
| CN117240277B (en) | Substrate selection circuit and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 518109 1st-6th floor, 1st floor, 6th floor, No.7 office building, yuan plant area, Longcheng industry and trade, Gaofeng community, Dalang street, Longhua District, Shenzhen, Guangdong Province Applicant after: Shenzhen lvlian Technology Co.,Ltd. Address before: 518109 1st-6th floor, 1st floor, 6th floor, No.7 office building, yuan plant area, Longcheng industry and trade, Gaofeng community, Dalang street, Longhua District, Shenzhen, Guangdong Province Applicant before: SHENZHEN GREEN CONNECTION TECHNOLOGY Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |